



plasticiser was employed in order to give an elongation of 100 at 25 C.: y v

. v um re ommen son Per can* L0 i 1 Per om: lign, n. dymmm-mm neatstabu- Flex 'remswam Hllutioiaer by Pn' Cent ity (hr. at perature out Wm by .C Air Water ou 150@ @CJ Wlsht C. 25 40 C. 60a o. 25o Q 25o C.

a a :i .a s: if -si .ai i -ra s" DMW]llimyllfwflhmw-f 4o eo 12o 115 265 122 -o1 21.1 4 :solo Ng Y v31.8 68.2 5l lll) 150 L2 0.1 12.0 4 3S.5 N0

The test procedures are described in Ind. Eng. Chem. 35, p. 8960943).

In other tests vplastic films were made by dissolving the plasticizers and various resinsin suitable solvents, casting into sheets and then evaporating the solvents.

The resins employed were vinylite (a copolymer of 95% vinyl chloride and 5% vinyl acetate), ni.- trocellulose, ethyl cellulose, and cellulose acetate.

The following tables show the results of these tests: l

4. A composition as set forth in claim 3 in which the phenylphosphonate is dioctyl phenylphosphonate.

5. A copolymer of 80 to 95% vinyl chloride and 20 to 5% vinyl acetate plastic composition containing a plasticizing proportion of dioctyl phenylphosphonate.

6. A nitrocellulose plastic composition containing a plasticizing proportion of dioctyl phenylphosphonate.

7. An ethyl cellulose plastic composition con- Soln. Film Spewing Flammability vogttill?, i. VINYLITE (20% SOLUTION IN METHYL ETHYLVKETONE) Plasticizer (26% by wt. of plastic): Y

Dioctyl phenylphosphonate `Clear... Clear Nil Does not support llame.. 8/ of lasicizer. Dibutyl phenylphosphonate .d0. ...do .do. .-..do 64 a plasticiaer.

2. NITROCELLULOSE (11% SOLU'IIgg IN MIXTURE 0F METHYL ETB'YL YL ALCOHOL'SWO, TOLUOL 30% (BY W Kg'roNE 211%, BUTYL ACETATE 20%,

Plasticlzer (26% by wt. of plastic):

Dioetyl phenylphosphonate Dibutyl phenylphosplionate. A

' Clear.

01an- -.-do

3. ETHYL opLLULosEv (20% -soLU'rIoN 1N MIXTUR'E or v, Y y. ETHYLAL Plasticizer v(110% by wt. of piasuc v lDioctyl phenyllphosphonam Dibutyl pheny phosphonate Clem- L c cELLoLosE ACETATE (20% soLUTIoN 1N aoE'roNa) Y c Plasticizer (43% by wt. of plastic):

Dioctyl phenylphosphonate Dibutyl phenylphosphonate oca'. or piasncizer.

Supports flame The term vinylite as used in the claims is intaining a plasticizing proportion of dioctyl tended to mean a copolymer of a. major proportion of vinyl chloride and amino'r amount of vinyl acetate, generally from 80 to 95% vinyl chloride and 20 to 5% vinyl acetate.

a boiling point at 3 mm. absolute pressure of not substantially less than 160 C.

3. A composition comprising an organicl plastic of the group consisting of a copolymer of a major proportion of vinyl chloride and a minor proportion of vinyl acetate, nitrocellulose, and ethyl cellulose and containing a plasticizing'proportion of a dialkyl phenylphosphonate containing from 4 to 8 carbon atoms in thealkyl group.

pages 335, 336, 337 and 338.

phenylphosphonate. y

8. A composition as set forth in claim 3 in which the alkyl groups are butyl.

9. A composition as set forth in claim. 3 which the alkyl groups are octyl.

10. A composition as set forth in claim 3 in winch the alkyl groups are amyl.

11. Dioctyl phenylphosphonate.

12. A composition comprising a copolymer of to 95% Vinyl chloride and 20 to 5% vinyl acetate and containing a plasticizing'proportion of a dialkyl phenylphosphonate containing from 4 to 8 carbon atoms in the alkyl groups.

ARTHUR DOCK FON TOY.

REFERENCES CITED vThe following references are of record in the file of this patent:

UNITED STATES PATENTS Name L Date .'rilint et al. a Mar. 2l, 1939 l OTHER REFERENCES Michaelis, Ber. Deut.. Chem. Ges. 181

Number 

